Feel the difference the second you pick it up! The Polymer80 Lower Receiver features rock solid frame, injection molded from a fully automated system that was two years in the making. This system is designed as a complete kit. There's NO expensive jig kits and parts to purchase - Polymer80's system is a COMPLETE, all inclusive package in one price! The LR-308 Warrhogg version features Polymer80's proprietary polymer composite, a solid core design, stiffened magwell and beefier MILSPEC buffer tube housing. The pistol grip area features a unique no-thread design specific to Polymer80 lowers. The jig is included in the price of this system. The kit comes with drill bits and the end mill bit that's required to finish your AR project the right way. Kit Includes: Lower and Jig Kit includes: (1) LR-308 Lower Receiver: W308 Lower (1) Pistol Grip Nut: 3/8" (1) Pistol Grip Screw: 1.5" Jig Parts Include (1) Warrhogg .308 Jig: J100 (1) End Mill Bit with Laser Etched Depth Mark: 7/16" End Mill Bit (1) Drill Bit, Safety Selector Switch Hole: 3/8" Drill Bit (1) Drill Bit, Pin Holes for Trigger & Hammer: 5/32" Drill Bit (1) Drill Bit, For Trigger Hole: 5/16" Drill Bit (1) Trigger Guide: TG100 Features Unique reinforced polymer design with solid core design ATF compliant design Beefed up buffer tube ring and ribbing across the entire upper surface area No-thread design on pistol grip area Stiffened magwell, ultra-light design